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【OG20-P276-272题】
Lines k and m are parallel to each other. Is the slope of line k positive?
(1) Line k passes through the point (3,2).
(2) Line m passes through the point (−3,2).
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条件1:至少要知道两个点坐标,才能求斜率,不充分
条件2:也不充分
结合:m和k斜率相同,但是都只是知道一个点,不充分
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